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<center><h1>Count.java</h1></center><p><br>

Below is the syntax highlighted version of <a href = "Count.java">Count.java</a>.
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<pre><tt><span class="comment">/******************************************************************************</span>
<span class="comment"> *  Compilation:  javac Count.java</span>
<span class="comment"> *  Execution:    java Count alpha &lt; input.txt</span>
<span class="comment"> *  Dependencies: Alphabet.java StdOut.java</span>
<span class="comment"> *</span>
<span class="comment"> *  Create an alphabet specified on the command line, read in a </span>
<span class="comment"> *  sequence of characters over that alphabet (ignoring characters</span>
<span class="comment"> *  not in the alphabet), computes the frequency of occurrence of</span>
<span class="comment"> *  each character, and print out the results.</span>
<span class="comment"> *</span>
<span class="comment"> *  %  java Count ABCDR &lt; abra.txt </span>
<span class="comment"> *  A 5</span>
<span class="comment"> *  B 2</span>
<span class="comment"> *  C 1</span>
<span class="comment"> *  D 1</span>
<span class="comment"> *  R 2</span>
<span class="comment"> *</span>
<span class="comment"> *  % java Count 0123456789 &lt; pi.txt</span>
<span class="comment"> *  0 99959</span>
<span class="comment"> *  1 99757</span>
<span class="comment"> *  2 100026</span>
<span class="comment"> *  3 100230</span>
<span class="comment"> *  4 100230</span>
<span class="comment"> *  5 100359</span>
<span class="comment"> *  6 99548</span>
<span class="comment"> *  7 99800</span>
<span class="comment"> *  8 99985</span>
<span class="comment"> *  9 100106</span>
<span class="comment"> *</span>
<span class="comment"> ******************************************************************************/</span>

<span class="preproc">package</span><span class="normal"> edu</span><span class="symbol">.</span><span class="normal">princeton</span><span class="symbol">.</span><span class="normal">cs</span><span class="symbol">.</span><span class="normal">algs4</span><span class="symbol">;</span>


<span class="comment">/**</span>
<span class="comment"> *  The </span><span class="keyword">&lt;tt&gt;</span><span class="comment">Count</span><span class="keyword">&lt;/tt&gt;</span><span class="comment"> class provides an {</span><span class="type">@link</span><span class="comment"> Alphabet} client for reading</span>
<span class="comment"> *  in a piece of text and computing the frequency of occurrence of each</span>
<span class="comment"> *  character over a given alphabet.</span>
<span class="comment"> *  </span><span class="keyword">&lt;p&gt;</span>
<span class="comment"> *  For additional documentation,</span>
<span class="comment"> *  see </span><span class="keyword">&lt;a</span><span class="normal"> </span><span class="type">href</span><span class="symbol">=</span><span class="string">"http://algs4.cs.princeton.edu/55compress"</span><span class="keyword">&gt;</span><span class="comment">Section 5.5</span><span class="keyword">&lt;/a&gt;</span><span class="comment"> of</span>
<span class="comment"> *  </span><span class="keyword">&lt;i&gt;</span><span class="comment">Algorithms, 4th Edition</span><span class="keyword">&lt;/i&gt;</span><span class="comment"> by Robert Sedgewick and Kevin Wayne.</span>
<span class="comment"> *</span>
<span class="comment"> *  </span><span class="type">@author</span><span class="comment"> Robert Sedgewick</span>
<span class="comment"> *  </span><span class="type">@author</span><span class="comment"> Kevin Wayne</span>
<span class="comment"> */</span>
<span class="keyword">public</span><span class="normal"> </span><span class="keyword">class</span><span class="normal"> </span><span class="classname">Count</span><span class="normal"> </span><span class="cbracket">{</span>

<span class="normal">    </span><span class="comment">// Do not instantiate.</span>
<span class="normal">    </span><span class="keyword">private</span><span class="normal"> </span><span class="function">Count</span><span class="symbol">()</span><span class="normal"> </span><span class="cbracket">{</span><span class="normal"> </span><span class="cbracket">}</span>

<span class="normal">    </span><span class="comment">/**</span>
<span class="comment">     * Reads in text from standard input; calculates the frequency of</span>
<span class="comment">     * occurrence of each character over the alphabet specified as a</span>
<span class="comment">     * commmand-line argument; and prints the frequencies to standard</span>
<span class="comment">     * output.</span>
<span class="comment">     */</span>
<span class="normal">    </span><span class="keyword">public</span><span class="normal"> </span><span class="keyword">static</span><span class="normal"> </span><span class="type">void</span><span class="normal"> </span><span class="function">main</span><span class="symbol">(</span><span class="normal">String</span><span class="symbol">[]</span><span class="normal"> args</span><span class="symbol">)</span><span class="normal"> </span><span class="cbracket">{</span>
<span class="normal">        </span><span class="usertype">Alphabet</span><span class="normal"> alphabet </span><span class="symbol">=</span><span class="normal"> </span><span class="keyword">new</span><span class="normal"> </span><span class="function">Alphabet</span><span class="symbol">(</span><span class="normal">args</span><span class="symbol">[</span><span class="number">0</span><span class="symbol">]);</span>
<span class="normal">        </span><span class="type">int</span><span class="normal"> R </span><span class="symbol">=</span><span class="normal"> alphabet</span><span class="symbol">.</span><span class="function">R</span><span class="symbol">();</span>
<span class="normal">        </span><span class="type">int</span><span class="symbol">[]</span><span class="normal"> count </span><span class="symbol">=</span><span class="normal"> </span><span class="keyword">new</span><span class="normal"> </span><span class="type">int</span><span class="symbol">[</span><span class="normal">R</span><span class="symbol">];</span>
<span class="normal">        </span><span class="keyword">while</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">StdIn</span><span class="symbol">.</span><span class="function">hasNextChar</span><span class="symbol">())</span><span class="normal"> </span><span class="cbracket">{</span>
<span class="normal">            </span><span class="type">char</span><span class="normal"> c </span><span class="symbol">=</span><span class="normal"> StdIn</span><span class="symbol">.</span><span class="function">readChar</span><span class="symbol">();</span>
<span class="normal">            </span><span class="keyword">if</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">alphabet</span><span class="symbol">.</span><span class="function">contains</span><span class="symbol">(</span><span class="normal">c</span><span class="symbol">))</span>
<span class="normal">                count</span><span class="symbol">[</span><span class="normal">alphabet</span><span class="symbol">.</span><span class="function">toIndex</span><span class="symbol">(</span><span class="normal">c</span><span class="symbol">)]++;</span>
<span class="normal">        </span><span class="cbracket">}</span>
<span class="normal">        </span><span class="keyword">for</span><span class="normal"> </span><span class="symbol">(</span><span class="type">int</span><span class="normal"> c </span><span class="symbol">=</span><span class="normal"> </span><span class="number">0</span><span class="symbol">;</span><span class="normal"> c </span><span class="symbol">&lt;</span><span class="normal"> R</span><span class="symbol">;</span><span class="normal"> c</span><span class="symbol">++)</span>
<span class="normal">            StdOut</span><span class="symbol">.</span><span class="function">println</span><span class="symbol">(</span><span class="normal">alphabet</span><span class="symbol">.</span><span class="function">toChar</span><span class="symbol">(</span><span class="normal">c</span><span class="symbol">)</span><span class="normal"> </span><span class="symbol">+</span><span class="normal"> </span><span class="string">" "</span><span class="normal"> </span><span class="symbol">+</span><span class="normal"> count</span><span class="symbol">[</span><span class="normal">c</span><span class="symbol">]);</span>
<span class="normal">    </span><span class="cbracket">}</span>
<span class="cbracket">}</span>


<span class="comment">/******************************************************************************</span>
<span class="comment"> *  Copyright 2002-2015, Robert Sedgewick and Kevin Wayne.</span>
<span class="comment"> *</span>
<span class="comment"> *  This file is part of algs4.jar, which accompanies the textbook</span>
<span class="comment"> *</span>
<span class="comment"> *      Algorithms, 4th edition by Robert Sedgewick and Kevin Wayne,</span>
<span class="comment"> *      Addison-Wesley Professional, 2011, ISBN 0-321-57351-X.</span>
<span class="comment"> *      </span><span class="url">http://algs4.cs.princeton.edu</span>
<span class="comment"> *</span>
<span class="comment"> *</span>
<span class="comment"> *  algs4.jar is free software: you can redistribute it and/or modify</span>
<span class="comment"> *  it under the terms of the GNU General Public License as published by</span>
<span class="comment"> *  the Free Software Foundation, either version 3 of the License, or</span>
<span class="comment"> *  (at your option) any later version.</span>
<span class="comment"> *</span>
<span class="comment"> *  algs4.jar is distributed in the hope that it will be useful,</span>
<span class="comment"> *  but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<span class="comment"> *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the</span>
<span class="comment"> *  GNU General Public License for more details.</span>
<span class="comment"> *</span>
<span class="comment"> *  You should have received a copy of the GNU General Public License</span>
<span class="comment"> *  along with algs4.jar.  If not, see </span><span class="url">http://www.gnu.org/licenses.</span>
<span class="comment"> ******************************************************************************/</span>
</tt></pre>

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Last updated: Mon Mar 21 10:51:08 EDT 2016.
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